Here are two examples from 60+ Slate cards in my collection. One is obviously hand-cut (Salkeld); and, the other is Factory-cut.
A fair number of these color-error cards are indeed Factory-cut.
And that does not surprise me because when I opened up 1949 BOWMAN 5-cent packs, I do remember finding color-error cards.
Not that often; nevertheless, some which were mostly from the 3rd Series issue.
Hi samosa4u
Here is an uncut sheet of Hi # cards (#37 - 72) from the 1948 BOWMAN Basketball set that you alluded to. Typically, Zabel Bros.
employees would take home such mis-printed sheets. Eventually, these 36 cards would be cut up then distributed into the hobby.
Quite a number of these sheets were discovered back in the 1970's.
TED Z
T206 Reference
.